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  1. Fullux

    Theropod

    Been trying to identify this digit for a while. Recieved it as a gift from a friend. I can't remember exactly if it was from Wyoming or Montana, but it was one of the two.
  2. Fragment takes up most of the sediment which is 1.5cm please not the serrations in the photos. All photos are the same with different lighting. @Troodon @jpc Is this actually a tooth fragment or are the serrations fooling me?
  3. Big news today impacting the ongoing controversy if large theropods were lipped. Abstract: Large theropod dinosaurs are often reconstructed with their marginal dentition exposed because of the enormous size of their teeth and their phylogenetic association to crocodylians. We tested this hypothesis using a multiproxy approach. https://www.science.org/doi/10.1126/science.abo7877 Mark Witton blog http://markwitton-com.blogspot.com/2023/03/new-paper-fresh-evidence-and-novel.html
  4. poponpo

    vertebral air sac

    The other day, I was indebted to you for the spinosaurus vertebral fossil. I have a question. Does the dinosaur's air sac match the marked part in the picture? The fossil in the photo is the sacrum of spinosauridae. Thank you . (⌒‐⌒)
  5. poponpo

    dinosaurus vertebral

    Is there a way to distinguish the vertebral of theropods and ornithopods? They the same to the untrained eye.
  6. Fossil Collect

    Allosaurus tooth?

    Hello, I saw this tooth labeled as an allosaurus from the Morrison formation. Not sure if it’s allosaurus but does look to be. Tooth is from Moffat Counth Colorado. Also is that a sauropod tooth on the matrix on the 2nd pic? Allo tooth is 4.1 cm. Thanks.
  7. BirdsAreDinosaurs

    Illustration of Deltadromeus agilis

    Hi all. This is my take on Deltadromeus agilis, the "agile delta runner". Here it is chasing a nice fat beetle.
  8. Frightmares

    Dakotaraptor tooth?

    Just want to get some opinions before I purchase a tooth. Do you guys think this is definitely a Dakotaraptor tooth? Or does it look more Nano? Size is .71” and it’s from Hell Creek Formation, Garfield County, Montana. 24506BD7-17AC-42BF-B3C6-7C613A84332B.webp 31C05BFB-8621-4C95-9A7A-4A92A0C553D7.webp E6280DD3-5623-4D78-966F-F7A20751CEFB.webp 7CFB9AAF-269D-48B6-A26E-5265AE476524.webp E04ED762-40B5-42D1-BADA-52A77A44425B.webp
  9. Ginger0412

    is this a claw?

    Is this a theropod claw? Also, is this from Niger, rare? Please tell me. Thanks in advance.
  10. svcgoat

    Timurlengia?

    So when I purchased this tooth it was listed as Timurlengia, however I know there have been recent discoveries of both a large Dromaeosaurid and carcharodontosaurid from this formation. Is there any way to figure out if this is Tyrannosauroid for sure? Uzbekistan - Bissekty Formation @Troodon
  11. HI all! I am pretty sure this is a theropod tooth - it has carinae but only on one side. It's curve is odd though. I can't quite seem to place an ID on it. Any help will be appreciated! It's 4 mm
  12. Daze

    Theropod phalanx toe bone?

    Just purchased this phalanx toe bone. It was sold as Spinosaurus, however I guess it's impossible to ID it like that. Just want confirmation it's indeed a theropod phalanx toe bone. Location: Taouz, South Morocco Size: 4cm (1.58")
  13. Hi everyone, I recently acquired a batch of small theropod teeth and was hoping to get a second opinion on some ids since a few seem kinda special. The first one I'm really leaning towards Dakotaraptor. 2-5 I'm not sure. They're all very similar looking but have very different base shapes including oval, almond, pinched rectangle, and pinched almond. The serration densities are also very interesting. The mesial serrations on all are much smaller than the distal serrations. The last one I think is a really tiny T-Rex. It's a dead ringer for a large Rex just very small. All six are from The Hell Creek of Carter County, Montana. Any insight is greatly appreciated as always! Tooth 1: Tooth 2: Tooth 3: Tooth 4: Tooth 5: Tooth 6:
  14. BirdsAreDinosaurs

    Study of the head of Rugops primus

    This is a digital study of the head of Rugops primus. I screwed up some of the teeth (too recurved). I really should know better, haha.
  15. Ntinostamp

    What kind of fossil is this ?

    Hello and good evening. I found that in an unexplored area besides a river ,in a village close to Athens, Greece. Through research i find many similarities with claws of small theropods. Its size is around 3 cm length. Any ideas what exactly is it? Appreciate your time.
  16. okfossilcollector

    ID?

    I bought this tooth and in my limited knowledge I'm not sure it's a raptor, I do not have a big collection of teeth to compare it to, so I figured I'll ask the experts. Hellcreek formation, MT. 4 denticles/mm it's the same both sides, 13.6mm CH, 4.2mm CBW, 9.07mm CBL both sides denticles look the same to me. If any more pictures are needed, I can get them. also sorry about the photos I'm getting a better magnifying device, my little coin one isn't too good for big over all pictures.
  17. New paper on cf. Spinosaurus dental pathology. https://www.sciencedirect.com/science/article/pii/S0195667123000277 Paywalled
  18. Hi all, Any thoughts on the ID of this claw? About 3 cm long, sold as ?dromaeosaur claw from Hell Creek, Slope County, ND. The phalanx was found in the same location but not articulated. I've chewed through the excellent "Identification of Claws/Unguals from the Hell Creek/Lance Formations" topic but can't quite fit it to anything!
  19. The Eumaniraptora is a clade of non-avian theropod dinosaurs that first emerged during the late Jurassic period and diversified extensively during the subsequent Cretaceous period (143-66 Million years ago). This group is most famously known as the Raptor dinosaurs (the sister clade of the theropod dinosaurs that gave direct rise to the birds), consisting of mostly small to mid sized theropod dinosaurs. There are a few species though that exceed the typical small-medium size range for the raptor dinosaurs. Only a few giant raptor dinosaurs are currently known. But recent discoveries over the past few decades have demonstrated large raptor dinosaurs were less of an exception in Cretaceous ecosystems than previously thought. Here is a list of all the currently known giant Eumaniraptora from the fossil record which hopefully can expand our understanding the vital roles these animals played in the ecosystems they once inhabited. Let me know if I forgot any examples. South America Austroraptor cabazai (Dromaeosauridae - Argentina, South America) (Late Cretaceous (78-66 Million Years ago)) (grew up to 6 meters (20 feet) in length) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2679073/ Antarctica Imperobator antarcticus (Eumaniraptora - part of what is now James Ross Island, Antarctica) (Late Cretaceous (71 Million Years ago)) (grew up to 4 meters (13 feet) in length, note: did not have the iconic pair of sickle shaped claw on its feet like most other Eumaniraptora) https://www.sciencedirect.com/science/article/abs/pii/S0195667118300120?via%3Dihub Asia Achillobator giganticus (Dromaeosauridae - part of what is now Mongolia, Asia) (Late Cretaceous (96-89 Million Years ago)) (grew up to 5 meters (16 feet) in length) Perle, A.; Norell, M. A.; Clark, J. M. (1999). "A new maniraptoran Theropod−Achillobator giganticus (Dromaeosauridae)−from the Upper Cretaceous of Burkhant, Mongolia". Contributions from the Geology and Mineralogy Chair, National Museum of Mongolia (101): 1−105. Unnamed Bissekty Formation Giant Dromaeosauridae (Dromaeosauridae (could possible be a species of Itemirus) - part of what is now Uzbekistan, Asia) (Late Cretaceous (92-90 Million Years ago)) (based on Specimens CCMGE 600/12457, ZIN PH 11/16, grew up to 5.5 meters (18 feet) in length) https://www.researchgate.net/publication/263891965_Dromaeosauridae_Dinosauria_Theropoda_from_the_Bissekty_Formation_Upper_Cretaceous_Turonian_of_Uzbekistan_and_the_phylogenetic_position_of_Itemirus_medullaris_Kurzanov_1976 https://www.cambridge.org/core/journals/geological-magazine/article/abs/giant-dromaeosaurid-theropod-from-the-upper-cretaceous-turonian-bissekty-formation-of-uzbekistan-and-the-status-of-ulughbegsaurus-uzbekistanensis/4543ABAB1EC19C84405EDF66A5F53124 Europe Unnamed Wessex Formation Giant Dromaeosauridae (Dromaeosauridae (specimens for this species could belong to Vectiraptor) - Isle of Wight, Great Britain, Europe) (Early Cretaceous (125 Million Years ago)) (based on Specimens IWCMS.2002.1, IWCMS.2002.3, IWCMS.2002.4., and BMNH R 16510, grew up to 5.5 meters (18 feet) in length) https://www.researchgate.net/publication/222830089_The_first_record_of_velociraptorine_dinosaurs_Saurischia_Theropoda_from_the_Wealden_Early_Cretaceous_Barremian_of_southern_England https://www.sciencedirect.com/science/article/abs/pii/S0195667121003712 Unnamed Giant Dromaeosauridae (Dromaeosauridae - Gorodishchenskii District Russia, Europe) (Late Cretaceous (72.1-66.0 Million Years ago)) (based on Specimen VGI. no. 231/2, grew up to 5.8 meters (19 feet) in length) https://www.researchgate.net/publication/235806763_Carnivorous_dinosaurs_Saurischia_Theropoda_from_the_Maastrichtian_of_the_Volga-Don_Interfluve_Russia North America Utahraptor ostrommaysi (Dromaeosauridae - Western North America) (Early Cretaceous (135-130 Million Years ago)) (grew up to 5.5 meters (18 feet) in length) https://www.researchgate.net/publication/285714464_A_large_dromaeosaur_Theropoda_from_the_Lower_Cretaceous_of_eastern_Utah Dakotaraptor steini (Dromaeosauridae - Western North America) (Late Cretaceous (66 Million years ago)) (grew up to 5.5 meters (18 feet) in length) https://www.researchgate.net/publication/283655219_The_first_giant_raptor_Theropoda_Dromaeosauridae_from_the_Hell_Creek_Formation Unnamed Marshalltown Formation Giant Dromaeosauridae (Dromaeosauridae - Eastern North America) (Late Cretaceous (72.1 Million Years ago)) (based on Specimen NJSM 14158, grew up to 5.5 meters (18 feet) in length) https://www.researchgate.net/publication/327117985_The_distinctive_theropod_assemblage_of_the_Ellisdale_site_of_New_Jersey_and_its_implications_for_North_American_dinosaur_ecology_and_evolution_during_the_Cretaceous https://terpconnect.umd.edu/~gdouglas/raptor/index.html Unnamed Tar Heel Formation Giant Dromaeosauridae ((Dromaeosauridae - Eastern North America) (Late Cretaceous (78.5-77.1 Million Years ago)) (Based on Specimen YPM.VPPU.021397, grew up to 3.4 meters (11 feet 2 inches) in length) https://peerj.com/preprints/26829/ Alaska Troodontid (Troodontidae (could be a species of Troodon or a new genus in Troodontidae) - Prince Creek Formation Alaska, Western North America) (Late Cretaceous (70.6-69.1 Million Years ago) (grew up to almost 4 meters (13 feet) in length) https://www.researchgate.net/publication/236632883_On_the_Occurrence_of_Exceptionally_Large_Teeth_of_Troodon_Dinosauria_Saurischia_from_the_Late_Cretaceous_of_Northern_Alaska Latenivenatrix mcmasterae (Troodontidae - Dinosaur Park Formation, Alberta Canada, Western North America) (Late Cretaceous (75.5 Million years ago)) (grew up to 3.5 meters (11.5 feet) in length) https://tspace.library.utoronto.ca/bitstream/1807/78296/1/cjes-2017-0031.pdf Unnamed Mount Laurel Formation Giant Dromaeosauridae (Dromaeosauridae - Eastern North America) (Late Cretaceous (72.1 Million Years ago)) (based on Specimen NJSM GP 22949, grew up to 3.4 meters (11 feet 2 inches) in length) https://royalsocietypublishing.org/doi/10.1098/rsos.191206 What do you guys think?
  20. Hello! Looking to ID this asian theropod tooth from the late cretaceous of Bayankhongor, Mongolia that is supposedly from Alioramus sp. The serrations are quite worn for this rooted tooth and are hard to see, the entire tooth measures 60mm Below I've attached some pictures, thanks in advance!
  21. ThePhysicist

    Juvenile T. rex tooth

    From the album: Hell Creek / Lance Formations

    Interesting blue color near the base, and some feeding wear at the tip of this immature Tyrannosaurid tooth.
  22. I recently found on the site cults3d a very beautiful and almost complete skeleton of Microraptor gui to print with a 3D resin printer. Here is the link: https://cults3d.com/fr/mod%C3%A8le-3d/art/microraptor-gui-skeleton The only problem was the skull was missing. The creator of this specimen, Florent Germain, had not had time to finalize his skull. He'll put it later, when finished, he said. I was able to print this model and I decided to make the skull myself Lucky me, I was able to use a dental scanner (not too suitable for this kind of models) and to generate a 3d printable file . The STL file of the skull is available for free. I am not a pro of 3D modeling software so be indulgent with the result. This file can be modified or improved for the person who can. Here the link : https://cults3d.com/fr/modèle-3d/divers/microraptor-gui-dinosaur-skull-open-source I haven't tried to print it on a printer, but it should work. Enjoy ! Some photos of the skull and skeleton, I'll update this topic when everything will be finished.
  23. BirdsAreDinosaurs

    Encounter with a Carcharodontosaurus

    Even though I like and support the development of portraying dinosaurs as real animals instead of monsters, it is hard to deny that an encounter with a big theropod must have been a pretty scary experience.
  24. Hello, Another microfossil from Wealden. This is very small, 3mm. Now, it's recurved and looks theropod, but it is notable different than the typical small Nuthetes/raptor type teeth we get from there. It also looks different than croc teeth. It is small, 3mm with the tip missing. The base is largely encased in the matrix, but the little bit that is is exposed suggests it to be slightly oval in shape rather than round. There are no visible serrations. If anyone has any thoughts, that would be great, I plan to take it to a dinosaur museum I will visit soon for a look too.
  25. Hi, I know claws from the Kem Kem are very hard to identify since not much is published on them, but this is a small 2.1cm claw from the Kem Kem with a curved shape that makes me think that it might be enough to determine if it is theropod (as listed) or croc or even turtle. My gut tells me it is likely to be croc or turtle, but I think some members here might have claws just like this in their collection, so thought it would be worth asking.
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